US 9,866,863 B1 · Affine motion prediction in video coding

Abstract

A block of a video frame may be predicted and decoded using a local affine motion prediction scheme. At least three points within the video frame are selected, each point being adjacent to a respective corner of the current block to be encoded. For each point, a motion search is performed for a template block centered about the point within a reference frame to find a template reference block. The template reference block has a center point that forms an anchor point pair with the corresponding point adjacent to the current block. Using coordinates of the anchor point pairs, affine coefficients for an affine transformation are generated. Using the affine transformation, a prediction block for the current block is generated and used to encode the current block within a bitstream. Providing the local affine motion prediction scheme can improve the prediction of certain blocks with complex motion, increasing compression.

Claims20

Dependent claims

A method of decoding an encoded video frame, comprising:

receiving an encoded bitstream representative of a video signal including the encoded video frame;
identifying, within the encoded bitstream, at least three points located within the encoded video frame, each point of the at least three points adjacent to a respective corner of a current block of the encoded video frame;
for each point of the at least three points, performing a motion search for a template block centered within a reference frame about the point to find a template reference block, the template reference block having a center point forming an anchor point pair with the point of the at least three points;
generating a prediction block for the current block using affine coefficients, the affine coefficients generated using coordinates of the anchor point pairs;
and
decoding the current block to an output video stream using the prediction block.

3 more elements

An apparatus for decoding an encoded video frame, comprising:

a memory;
and
a processor configured to execute instructions stored in the memory to:
receive an encoded bitstream representative of a video signal including the encoded video frame;
identify, within the encoded bitstream, at least three points located within the encoded video frame, each point of the at least three points adjacent to a respective corner of a current block of the encoded video frame;
for each point of the at least three points, perform a motion search for a template block centered within a reference frame about the point to find a template reference block, the template reference block having a center point forming an anchor point pair with the point of the at least three points;
generate a prediction block for the current block using affine coefficients, the affine coefficients generated using coordinates of the anchor point pairs;
and
decode the current block to an output video stream using the prediction block.

6 more elements

Dependencies are inferred from the claim text.

Affine motion prediction in video coding

Life of this patent

Affine motion prediction in video coding

Life of this patent

Abstract

Claims20